Of the pre-election material that I received, only the 民主党 (Democratic Party of Japan) listed prior work experience. There are a lot of career politicians and people from academia, some from the financial sector, and a few general office workers. But nobody listed as being a former ball player. I didn't recognize any photos from the numerous other parties as being someone from a past player meikan, but that's not a very reliable method of searching.

This is a site about Pro Yakyu (Japanese Baseball),
not about who the next player to go over to MLB is.
It's a community of Pro Yakyu fans who have
come together
to share their knowledge and opinions with the world.
It's a place to follow teams and individuals playing
baseball in Japan (and Asia), and to learn about Japanese
(and Asian)
culture through baseball.

It is my sincere hope that once you learn a bit about
what we're about here that you will join the community of
contributors.